By definition, any curvature that is not spherical can be categorized as aspheric. The most common form of aspheric equation is as follows:
where A1, A2, A3, A4... are constants.
C is the reciprocal of
radius of curvature (1/R).
K is the conic constant. The height of the lens
is given by f(x):
There are many different kinds of aspheric lens
designs, they include aspheric-plano, aspheric-concave,
aspheric-convex, bi-aspheric, or aspheric lens arrays.
The shape of the entire lens can be obtained
by rotating the 2D curve along the X axis:
There are other kinds of aspheric
equation such as elliptical or parabolic.
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